Oil-free rotary tooth compressor

The utility model discloses an oil-free rotary tooth compressor which comprises a shell and a rotating shaft, the rotating shaft is sleeved with a bearing and installed in the shell, the rotating shaft is sleeved with an oil seal assembly and an air seal assembly, and the bearing, the oil seal assembly and the air seal assembly are sequentially distributed from outside to inside in the axial direction of the rotating shaft. The oil seal assembly comprises an oil seal ring arranged outside the rotating shaft in a sleeving mode, a first installation groove is formed between the inner wall of the shell and the outer wall of the rotating shaft, one end of the oil seal ring is connected with the bearing, the other end of the oil seal ring is in sealing fit with the first installation groove, and a spiral groove is formed in the inner wall of the side, close to the bearing, of the oil seal ring. The spiral groove is used for forming spiral sealing when the rotating shaft rotates; a plurality of rotary ring grooves